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  #41  
Old 11-07-2017, 04:54 PM
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Now, all I need to do is figure out an elegant flow control setup for the grant so I don't have to watch it so closely.
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  #42  
Old 11-08-2017, 10:21 AM
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I have never been able to choke back my pump enough to work well for the slow flow rate of the lauter. I wonder if you could put an inline rheostat and make them variable speed.
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  #43  
Old 11-08-2017, 11:41 AM
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Quote:
Originally Posted by Brandonovich View Post
I have never been able to choke back my pump enough to work well for the slow flow rate of the lauter. I wonder if you could put an inline rheostat and make them variable speed.
I know Stubby used a rheostat on his march pumps on his old stand but from what I have read it is not recommended. Something about shortening the life of the pump motor.
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  #44  
Old 11-08-2017, 12:11 PM
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Probably the same thing as using the wrong extension cord. Starves the motor of power.
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Keg 3Salted Grapefruit Saison
Keg 4Oak Aged Quad
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  #45  
Old 11-13-2017, 02:42 PM
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Ok, so my thought is to use a "floating Ball" valve setup inside the grant. I had looked into a float ball valve (like the kind in the tank of the toilet) but could not find one that met my specific needs. I was looking for one a valve that was inline, stainless and not $1000. I also wanted it to be easily removed and not have to modify the HopRocket so that I could still use it for its other functions.

So I decided to make my own. The first thought was to use a stainless tube pushed into the inlet hole and have a ball floating inside the tube. The tube would have tube would be bent at an angle and have either holes drilled or sections cut out at the end to allow the liquid to flow out. As the liquid level rises it lifts the float ball higher up the tube. Once the ball floats higher than the cutouts it would shut off flow. 2 issues: 1) I was concerned that the flow rate of the liquid would push the ball down to mush and not allow it to shut off the flow and 2) finding stainless hollow ball that small (about 11mm) has proven difficult. My current idea is to use the same tube but instead of a floating ball on the inside, use a floating ball on the outside surrounding the tube. And then have the cutouts above the ball and as the ball floats it will shut off the flow.

Here is a drawing of my current idea:

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  #46  
Old 11-13-2017, 02:45 PM
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Here are a few pics of the inside inlet opening and a piece of 1/2" OD stainless tube that fits inside the inlet opening very nice and snug.





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  #47  
Old 11-13-2017, 06:00 PM
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Take a look at using PWM, Pulse Width Modulation for controlling the pump. These are AC pumps and aren't as happy about under-voltage. A DC pump would REALLY shine in this situation. It's been a while since I looked at PWM so do some good reading up on it.
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